Speakers
Description
Radio galaxies are important laboratories for studying the physics of active galactic nuclei and their relativistic jets. In this study, I will investigate the multi-epoch hard X-ray emission from two nearby radio galaxies, NGC 1275 and Centaurus A. We present a multi-epoch study of the hard X-ray emission from the nearby radio galaxies Centaurus A and NGC 1275 using NuSTAR observations. The sources are investigated through spectral fitting with absorbed power-law models that include an Fe Kα emission line, allowing us to characterize their spectral shapes, line properties, absorption, and flux variability across different epochs. For Centaurus A, the photon index remains relatively stable at around Γ ≈ 1.82–1.85, while variations are observed in the absorbing column density, Fe Kα line width, and hard X-ray flux. Similarly, the NGC 1275 observations show a generally stable power-law continuum with Γ ≈ 1.7–2.0, accompanied by changes in the continuum normalization and Fe Kα line properties.